Trouble installing SwiftKey via APKPure

Question

I don't have a Google account and use APKPure (and F-Droid) to get most apps I need. Now, there are a few apps which, after download, refuse to install - they give me the "App not installed" error when I try to install them from within the APKPure interface. Right now I'm seeing this with the SwiftKey Keyboard application: I already use it, and I'm trying to install an upgrade of it but getting that error.




  • How can I determine why I'm getting the "App not installed" message?

  • Should I try installing in "Safe Mode"? I've heard about it but don't yet know how to get into it.

  • If I want to try and install manually - where do I find the APK file(s) for my app?



Additional informations:




  • I'm using a Xiaomi Redmi 3S with Android version 6.0.1.

  • SwiftKey is already installed and is in use; but just to be sure, I replaced it with another keyboard as the chose/active keyboard app and the results are the same.

  • The APK file seems to be this one (assuming I get the same file from my desktop and from my APKPure app on my Android device).

  • $ apksigner verify SwiftKey\ Keyboard_v6.6.9.32_apkpure.com.apk 
    
WARNING: META-INF/DEPENDENCIES not protected by signature. Unauthorized modifications to this JAR entry will not be detected. Delete or move the entry outside of META-INF/.


— einpoklum | Sources

Answer

Following @Izzy's patient advice in the comments, I got impatient and finally resolved this.



The reason for "App not installed" in OP's case



The pre-installed version of the SwiftKey Keyboard app had some sort of incompatibility with more recent versions - a "signature mismatch" - preventing an upgrade from the former to the latter.



Should I try installing in "Safe Mode"?



Not relevant in this case.



So how do I upgrade SwiftKey?



Uninstall SwiftKey (just the main package; there may be auxiliary packages) and install the new version.### How to determine why you get "App not installed" generally



It's tricky. What you can do is have a look at the "logs":




  1. Install a log viewer app like CatLog

  2. Install something like Termux (or an SSH server, then SSH into your phone)

  3. In a terminal, run adb logcat

  4. Try installing SwiftKey

  5. Have a look at the what you get in the log



You need to redirect the log output into a text file if you can't scroll your terminal well enough.


— einpoklum | Sources

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